BOOKREVIEWS
Nov. 5 , 1954
5577
tivities, dispersion, induced double refraction (Kerr effect, cept for the addition of the system NazO-B20a-SiOz remains Cotton-Mouton effect, flow birefringence), light scattering, unchanged. Chapter 111 on Composition contains some new analyses depolarization, double refraction in crystals, relation of structure to optical activity, the present status of theories of in Table 111. 2; 4 have been added to Table 111. 3 . Some optical activity, Faraday effect, Zeeman effect-to name recent high-index glasses are mentioned. Table 111. 11 on evolved gases on heating glass has been added. TWO short just a few of the many subjects treated. An interesting feature of the presentation is the frequent paragraphs on permeability to and diffusion of helium use made by the author of historical introductions to trace through glass close the chapter. Chapter IV on Durability adds a reference on Hubbard’s the experimental and theoretical development of various humidity-powder test, the Hubbard-Hamilton interferornephenomena. This treatise should serve as a valuable reference because ter studies; Figures IV. 7-8-9 on comparative resistance to various reagents are new. Mention of Wickers, Finn and it gives an excellent coverage of the classical theory of physical optics and its application to chemistry, and also covers Clabaugh’s tests on chemical ware concludes the chapter. Chapter V , Viscosity, except for the renumbering of some in considerable detail many topics which are involved in tables and figures is almost unchanged. The recent countercurrent research. balanced sphere method (1000-1400°) is introduced and a DEPARTMEST OF CHEMISTRY table of results follows. In the section on Viscosity of Slags CORNELL UNIVERSITY HAROLD A. SCHERAGAthere is a brief reference to recent work on iron-free systems. ITHACA,NEWYORK The chapter closes with Deformation and Transformation Temperatures including some recent contributions. In Chapter VI, Annealing, recent work on temperature Sometime Senior and refractive index correlation with annealing is mentioned. Magnetic Cooling. By C. G. B. GARRETT, Chapter VI1 discusses The Surface Tension of Glass. Scholar of Trinity College, Cambridge. The Harvard Fiber elongation apparatus and the dipping cylinder method University Press, Harvard University, and John Wiley and are included. The chapter closes with a discussion of the Sons, Inc., 440 Fourth Avenue, New York 16, N. Y. anomalous behavior of B z 0 ~and includes extensive surface 1954. x 110 pp. 14.5 X 22 cm. Price, $4.50. tension tables on Borates and Silicates. Additive relationThe author has planned his monograph as an introduction ship concludes the discussion. to the study of the properties of matter a t temperatures In Chapter VI11 on Heat Capacity of Glass a table of conbelow 1OK. The book covers practically all the phenomena version factors for units of energy has been added. encountered in adiabatic demagnetization and those Chapter IX is on Thermal Conductivity. Except for brought within the range of observation a t the temperatures very brief references to the measuring of combined heat made accessible by magnetic cooling. transfer by conduction and radiation, and the thermal conThe author states that “the book is not primarily aimed ductivity study of rocks, the chapter is unchanged. a t the specialist” and this is borne out, for example, by the Chapter X on The Density of Glass opens with a presenfact that the subjects of “Magnets” and “Experimental tation of recent views on additive factors, and includes exArrangements for Magnetic Measurements” are given tensive tables to indicate their applications. I t closes with slightly less than two pages each. However, the book is a discussion of the effect of heat treatment. the best collected source of recent information on its subject In Chapter X I on The Coefficient of Expansion of Glass a and justifies the authors expressed hope that i t will be of short paragraph on Li~O-ALOR-Si02has been inserted. value to both experimental and theoretical research workers Effects of MgO, BaO, ZnO in dolomitic limestone glasses; in this field. of Fe203, BzOs, K20, Lis0 conclude the three-component Theoretical discussions of thermodynamic-magnetic resection. Under Multicomponent and Commercial Glasses lationships, measurement of temperature, specific heat and Vycor and silica glasses are mentioned, and the comments paramagnetism a t low temperatures are followed by a chap- on Nonsilicate Glasses include Na2O-BsOa and KzO-Bz03. ter on the “Results of Measurements.” In Chdpter XI1 on Elastic Properties under Dimension and There is a 19-page chapter on the important subject of Units, strain discs and large astronomical lens-castings are cooperative effects and resultant hysteresis, and a final referred to. A section has been added on Effect of Temchapter discusses varied subjects, such as thermal conductivi- perature on Elastic Constants. Strain-time relationships ties, experiments on liquid helium and also on metals below (tables) and effects of low and high temperatures conclude 1“E;., nuclear alignment, cascade demagnetization and this discussion. cyclic refrigeration. The author’s discussion in this secAdditions in Chapter XI11 on The Strength of Glass are tion, of a “formal” case of “negative temperature,” based on weak secondary bonds, effect of moisture, strength of on non-equilibrium nuclear spin states is very unfortunate. fibers, micro-strength, effect of temperature on strength I t is the sort of thing with which newspaper reporters can, and fatigue. and probably will, do a great deal of damage. TemperaChapter XIV on Thermal Endurance is unchanged except ture has no meaning when the states used to define it are not that sections on Temperature Distribution during Heating in equilibrium. Innumerable cases in ordinary chemical and Cooling, and Optical Path Differences have been dethermodynamics could be cited in which corresponding leted. non-equilibrium systems exist. In Chapter XI’ on Hardness, abrasion is mentioned; hard There are very numerous references to original papers for glasses for jewel bearings are referred to; diamond indentathose who wish greater detail. tion of optical glass is compared with grinding hardness. We are glad to recommend the book to those interested Chapter XVI on Optical Properties, the first section has in phenomena a t very low temperatures. been enlarged, rearranged and augmented to great advanDEPT.OF CHEMISTRY A N D CHEM,ENGR. tage. Tantalum, tellurium have been added. There are UNIVERSITY OF CALIFORNIA TV. F. GIAUQUE new four-component and multi-component systems with accompanying tables, and under miscellaneous glasses, arBERKELEY, CALIFORNIA senic,, lanthanum, and new beryllium and germanium types are given. Fluoride and phosphate glasses are discussed. The Properties of Glass. By GEORGEW.MOREY,Geo- The new additive factors and methods are important. Effects of temperature and heat treatment on refractive index physical Laboratory, Carnegie Institution of Washington, are stressed. Sew infrared absorbents are listed, and reWashington, D. C. Reinhold Publishing Corp., 330 UT. flection-prevention is given a place. Finally, there are new 42nd St., New York 36, N. Y. 1954. vii 591 pp. sections on solarization, fluorescence and thermolumines16 X 23.5 cm. $16.50. cence. The original appeared as KO. 77 in the American Chemical Chapter XVII on The Electrical Conductivity of Glass is Society Monograph Series in 1938. The revised volume is practically unchanged, and very little has been added. Xo. 124 in the same series. The table of contents remains Chapter XVIII on The Dielectric Constant, Dielectric unchanged. This is a comparison review, Loss and Dielectric Strength, like the preceding chapter, is Chapter I remains unchanged. The history has not been almost unchanged. High-frequency Effect and Conduction, brought up-to-date, not even Table I , 3, on “Estimatai relaxation, defurination an(I \ ibratiou losses receive considIYorld Production” which still ~ C J not ~ S go beyond 1937. eration. There is a n added paragraph in the section on RfChapt.er I 1 o n Dpvitrification 113s brei1 re.irrangd but exfrct of Temperature on Power Factor.
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